What is the process for obtaining a Non-B visa in Thailand after a work permit and medical certificate update?

So went to immigration today in Nakhon Phanom. They gave out 100 numbers that was it... But they stayed there inside and outside till 8:30 tonight checking everyone's paperwork to make sure everyone who wasn't seen to today had it right for Monday.. and they did it with a smile and an explanation.... I had to get a new medical certificate as mines was past the sell by date for my new work permit... But got certificate done, work permit done and my paperwork checked for new non b on Monday. Letter from UK Embassy helped..stating I don't want 30 day tourist visa extension but new non b due to not being able to get due to covid (switched schools during amnesty) and my school was great sending 2 Thai teachers with me